The people around you that obsess about going to gyms. The type of guys and girls who look down upon those who don't make a vain attempt to be 21 again.
The guys who fit in this category are similar to Uncle Rico off Napoleon Dynamite; in the fact that they can't stop admiring their biceps when their arms are folded. The girls usually live in fear of stretch marks and bingo wings, and see themselves as high-flying corporate figures or Ally McBeal wannabes.

Body Nazi 1: "I feel so good, the £500 gym membership was totally worth it *admires biceps* I can't believe you don't do any, loser.."
me: "Uh, you have bigger man tits than the comic book guy off the simpsons. Enough said."